\begin{tikzpicture}
	\tkzDefPoints{-2/1.5/A, 2/-1.5/B, 2/2/C, -2/-2/D}
	\tkzInterLL(A,B)(C,D)   \tkzGetPoint{O}
	\tkzDefLine[bisector](A,O,D) \tkzGetPoint{E}
	\tkzDefLine[bisector](B,O,C) \tkzGetPoint{G}
	\tkzDefLine[bisector](A,O,C) \tkzGetPoint{H}
	\tkzDefLine[bisector](B,O,D) \tkzGetPoint{F}

	\tkzDrawSegments(A,B  C,D)
	\tkzDrawSegments[dashed](E,G)
	\tkzDrawSegments[dashed](H,F)
	\tkzLabelPoints[left](A)
	\tkzLabelPoints[right](C,H)
	\tkzLabelPoints[below](D,F,B, E,G)
	\tkzLabelPoints[below=0.5em, xshift=-0.5em](O)
\end{tikzpicture}

